Multi-domain surface mode device

Inactive Publication Date: 2003-07-15
SHARP KK
View PDF15 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to surface mode nematic liquid crystal devices with improved angular viewing characteristics. Conventional liquid crystal devices consist of a layer of liquid crystal confined between two glass or plastic substrates. Conventionally these substrates are uni-directionally rubbed or otherwise treated to cause the liquid crystal molecules in con

Problems solved by technology

However these devices suffer a disadvantage in that the optical characteristics vary non-uniformly when the device is viewed from different angles.
This variation in viewing characteristics with angle is undesirable when designing, for instance, a television screen to b

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multi-domain surface mode device
  • Multi-domain surface mode device
  • Multi-domain surface mode device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

Like reference numerals refer to like parts throughout the drawings.

FIG. 2 illustrates a transmissive surface mode liquid crystal device (LCD) comprising first and second polarizers 15 and 16 whose absorption axes 17 and 18 are orthogonal. The absorption axis 17 Is aligned at 45.degree. to a reference direction 19 whereas the absorption axis 18 is aligned at -45.degree. to the reference direction 19. As an alternative both a retarder of negative birefringence and a retarder of positive birefringence may be present.

A liquid crystal layer 20 and a fixed retarder 21 are disposed between the polarizers 15 and 16. The retarder 21 is of positive birefringence and is of uniform type with an optic axis 22 parallel to the direction 19. As an alternative, the retarder 21 may be of negative birefringence and the optic axis 22 may be perpendicular to the direction 19. As an alternative both a retarder of negative birefringence and a retarder of positive birefringence may be present.

The liquid c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A surface mode liquid crystal device, comprising a liquid crystal layer disposed between first and second alignment layers for substantially parallel-aligning the liquid crystal layer, the first alignment layer comprising a plurality of regions defining respective picture elements, each of the regions comprising a plurality of sub-regions, the plurality of sub-regions each comprising at least one first sub-region for aligning the adjacent liquid crystal In a first alignment direction and at least one second sub-region for aligning the adjacent liquid crystal in a second alignment direction substantially different from that of the first alignment direction.

Description

FIELD OF THE INVENTIONThe present invention relates to the field of visual displays and image processing devices such as flat-screen computer displays, televisions, 3D displays, projection devices, time-sequential color systems and head-mount displays.DESCRIPTION OF RELATED ARTU.S. Pat. No. 4,56,758 discloses a uniformly aligned 180.degree. twisted surface mode liquid crystal. The pi-cell and the chirally doped variant of the pi-cell described in U.S. Pat. No. 4,566,758 are so-called surface mode liquid crystal devices. Both are characterized by having the molecules in the central region of the liquid crystal remaining aligned almost perpendicularly to the cell surfaces during operation of the device, whilst molecules close to the surfaces undergo reorientation in response to varying electric fields. However these devices suffer a disadvantage in that the optical characteristics vary non-uniformly when the device is viewed from different angles. This variation in viewing characteris...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G02F1/1337G02F1/13G02F1/139G02F1/1335G02F1/13363
CPCG02F1/133753G02F1/1395G02F1/133784G02F1/133788G02F2001/133538G02F2413/09G02F1/133538G02F1/133631
Inventor WALTON, HARRY GARTHTOWLER, MICHAEL JOHN
Owner SHARP KK
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap